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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13eac55715674c2444930ab9f75aea93d6da3670112266f4d5179a13ad72a3bf' 
  AND token = 'vxvckRsU0/JOSXYp/MVIrbsOqYDE7I9vU+aQw8CT0ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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