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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb57cfcc9c2ac1fdb13940483cca2991affe1b53cbce30165888bb8bcc6fddba' 
  AND token = 'tcZzH5+Ae0nIv0rLssQVuU3NkTyTxk0NlsyL1dOSLZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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