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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceaadb644c9949b5e3bde678de529ae64df0326a649bc674f04a4fe56c2639b8' 
  AND token = 'htaI8zgbKbCvciO/1FcfBugzIYj6P8tAwNtpRkwL3o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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