SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad20911edfe613e5dcc26a325dfd27cc58b32991b26ce45f716078f7d6a1600' 
  AND token = 'tblEITUq1js4VwbJmNjNyGX9goBpMDJvnpCbDn2YzFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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