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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8753050630fd37b3a3d623041458d001ec030f688325c84d0ac805b26bf85d5a' 
  AND token = 'c134CuJFvgrmakmy/gS+4CsVAW/fIFZ5AaQAPL+tr98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}