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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f21f48cae5fe4009fd1ee44759ed0831fca7604fbec41180a8a45a408a54c9' 
  AND token = '08YDiCiK5kc2s2UWPSfeC3x5w9EuHI0JTG8LTlv4CgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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