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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c378032c37782634e803bf9ba9aa5a6243544e6979d37d896d2622e78c6b19de' 
  AND token = 'kBwod3wsdDemlH4u9HT3HTk7ML0/hWcvBrJRjuTmmp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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