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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b5e4bb0aee22b9bfb52fa883fabdadb4778e724c63b80a2247b0640bc3b3e4' 
  AND token = 'Wxby9ieBmJV4bKIT8/lIz2WK8ry/bo8p71OmjOaWuVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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