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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4c779b45d53f14791227adaad85a59da19be29d4fe4352e0bc66d439aa0587' 
  AND token = 'r/kj/c9GSgshkNlmbmaUTM66UwqEpfxiVq3lY2wQXNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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