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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4697448947726ecbb842e9e94ed1723a1ea4be64c81913fed5c11432c27ffa8' 
  AND token = '56jAlJv6J0eCY6rX3I/Za6wejZ5QqTvd7+5v5vol0WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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