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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fc9e880c2b937a8e5b4f2a1c74b61e7704eb79a1e6abd71ab3ec153b8aa5f7' 
  AND token = 'iKk6CbJv2kMGYt6WxXZSd3lIRuj0bulSj7YaZkj5zYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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