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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c0ae46ba4351e4920b7f4b886c4a0f8e6569e42e6b1d008dd8aa3f17c3f954' 
  AND token = '/0fk3BDAwUTlOjjUWNTVbGKbrchRTUk8S4GekNIo2qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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