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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508bcaebb5ea24d1153149d05a3c592aff16792b58bfcf06f96a706439509388' 
  AND token = 'NjA2rE099sVehyXxy2ve/9owiqhJFnn4wvM1x7xGRuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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