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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c792cd4e0d90577d246892d7004b75c4b649a64cb287ffb8c09e965a43e2794c' 
  AND token = 'tT+dRl8h2DeXCtCRoQlKs0JIK0rX5+YKJQyaaTkO43k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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