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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1ad90293a6ea02b8b920e5a9bdf97903c9f54958e1ff1e5120fe4c427b61e4' 
  AND token = 'Ca9DFsr+xoXaMWNBoWXkTIhQ8Qo15Rt57m7U38Ae/jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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