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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3eb45873aaf1261db5cecdb0521bdf4e5f0825d9738959adedd46df5cec204' 
  AND token = 'wbniDxU/IqvxTALudW95wo1HWL0xQQqbyPb/H9dEyDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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