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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36cf0c1498a95e7f9c60a869015360c19157be6875c5c60d5fb550c469ed31e' 
  AND token = 'bKoWUBNCDDgkaY4Ribwj2O33JSAUls4Lu/2MTi7ZeH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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