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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f1e465e6ac2d355875fec89799b3d3f12ca7dc103d8c5b714967b048e36d8d' 
  AND token = 'j5dBaXf6X0thakNdnIKwOOLi+EgFmqDUNA2RUwNnNbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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