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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12faca22155c9357731e864710e95b0e94b2fc2e63a23f9d312c17f37cbf3df3' 
  AND token = 'FU6W20fYe2t9jTZsUh2zSwDQ71x/rodOmNYpRSTDs1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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