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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999e94e9c675ad374bd6c92b71401a2929321d391dd66f4c0ead4da5c86e4ee3' 
  AND token = 'WmenHijUGU5EcOqmPHq/wbT06esNCeGXAzNqBu0FqTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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