SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58721e0660d27cb1452a3349cbbadfbe1548c831a5b5dd9bac07d3af61a0b107' 
  AND token = 'y/P4wJRCYedtheImzNuY3QfF+5UEjDVKQUrtXJJqbAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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