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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4d260b7e8a2447020e09486a88274280719f8c0323b0ef9b34c2a052ba0c03' 
  AND token = 'J7PB7E58MbPqKNFF2HR/cWr39KqrD2Bbybx3SPdGoVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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