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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ef045a1f0d6ed1b25ff47d245fe9de5e5c4b901ac966e3cb159c932fdc045b' 
  AND token = '88DUjSCqLz33DQTs1AaczsjFuJ1MVVz7Lhw5yZhbSno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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