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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd32cb24936b2b8a431e94ddb37a0b12661e084c5eb92aaa3c89a956edd80f1' 
  AND token = 'Xkl7eY1kgGgfwIqdeBM4hvKaeab8UocjXc2a8VsLhZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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