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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e766b037ea08e26f04fb7041678ae362c0a5531b94f8d8fd7eb64912e35e32ba' 
  AND token = 'Wqb/wZ4jkBujdb18ceYVDU6Ws8vtBlFS3QmM9O5I/7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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