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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8eb2cbf34050b94e7a156fc980ac75a93697684aea896eb2a88b729855fed2d' 
  AND token = 'mO5mXVV/oUifAQVX38F1DsEvh95WWtgMc0MFFNmwWx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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