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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27ff465c3ce7c5a43042709eb8b403b40007796d3e830c515b77e61c5f31fdc' 
  AND token = 'qhl56bmdciwIWOPN7ZcEwgiP94xoaiM5Zu7uNNGeGEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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