SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61bf5245713cd4d3dd4b6ebed062d3276933deb9f8af0f03646925738d8a317' 
  AND token = 'W9mhhYjHhjT6I8sJLnZbgsMoXZK/P6m7BbTxBdpotJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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