SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8bd885afdcd0f6c18837d9c4eab66f170adf3c8f5139d09e8ff2460459df6b' 
  AND token = 'PJtfJOIXq+YgPuytk1ZqQjV7PwnkE5CvRh/w58mwSas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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