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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d07c4176b2afe63e7e9fb7a6901a5ec8965ba358a94f0a95358dc7011b6c1a' 
  AND token = '3OpsftNw2CrWxD6TU6Ic9x++a5/nPj23v2+aS7mxeDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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