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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc597c57345d406a1892d3527ba6b9458330200926a44f96cd72a84051c26764' 
  AND token = 'XFM66EnrWIwPknrFaWuP0hl7e05nXrUH/OVsO+sFWUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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