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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe9d92e2fc15cbf77e5aa9bac6aecf5e059e85c90ba27c9501e7ddb5aafd9d4' 
  AND token = 'Vm3L/AAd8JQx6RMNZlzFRachk+xGVDIwc1yYSVAW3dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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