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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aef852c33bfcf73ee536e7fd8a34dd7fc07dcaa2008a977372eb6491ec5df3b' 
  AND token = '1pNaqXSU5T7bqR9j1zaPY5O0TBoIzw1/Zk0ZF/byTrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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