SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd781a7b5e22065fe89f69872fd67b6abf7b4917d80d93a64ac03cefa5f8ca571' 
  AND token = 'olrSRImjEK/6YZGRyCIUboguMHwzl0zJjiCyR7L6ZmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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