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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9aed9740bb5a994781f7cbfab9948d79507dcc70d97e3ee4413d1d37bf1074c' 
  AND token = '3vjHp+UWju1fqQZLO9FFUrMP0GOK6dDeLrKfY7oEvAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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