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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a0f7ac39831465237cb554b9642952963ecc0da64a605865054b0649d46962' 
  AND token = 'NS+wIkncagfHAZcUE3i5am27ByErn2QqZAEF2NBP7+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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