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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eddb8e5599a8b5f73412e87999b355e253c166e8ca77e5851fb55941c463f56' 
  AND token = 'mBz78q0ebxZM5PSegsTjzt/jeS8++rycKRpN64W4BCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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