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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6a4671d05d0c2b78a73b0f0629cb52b91c4b5dbc8ea2f1d7d0e5e7c4e42fc0' 
  AND token = 'ku0O8By5PMDPYZFAPSE2TiJZa8fbJF9Ugd9HAMohnlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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