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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6711e0dff7a5f257dbab5483cab460a0dbea78ad56e5f504b9b7d4667566a9d' 
  AND token = 's8lbRUMe+bq1i1/eqtQVcOGmP+MnzDzeSUpIwbyIpwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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