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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a8b92e9a40e95732d2a6bff818ae7d8e0e3601cb0fe5078c999b16c03e77be' 
  AND token = 'JY2DDa8fjBms9FkkJiLvm7u4P5ycVSf7tCW7Mx2Wuhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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