SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e3070762c10ff4e0e4da73a511cf3b5f89de7a4203a52ebdb543d99d57154a' 
  AND token = 'qfTZEViwXUr9dZT+8KYX9khW0/quSj+p3/dWg6Lw5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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