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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09d56988d590d02dd4650a90c9c737088107b1bd7878f6fb968fe7b773cb923' 
  AND token = 'wrdXqXjVd6tUyAJsvqQCHyf57Qfh1P81f4HYu62k3Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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