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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cebe311b9c7de8c295117d65ad662450f8f9691de6849ea677d963663914dd' 
  AND token = 'IKp3s+YCD9S1yTrbYLmYoL6nOjjBKtWkMSjfA4KNgDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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