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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3818f6ab5ff88f72852a5ce6d9330e3a4aa2393e68b0c8ed4268854e3f0f7017' 
  AND token = 'c3uF6lBh4NCUvFGRrwtHOzMmfRh5YdZuM92mQWQMJ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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