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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3c4528dca89d16f8e79b3598347c33520da7cca09466f4fd3347d50ece0252' 
  AND token = 'pwoZg917zQNdbsfJ4KlwTNsmfzJDuyPAvlk2GIwly0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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