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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1c5d5664f2ee2f095c00dccb9522269fdcc975d532bf882d9a04ed6eb6c688' 
  AND token = 'd5r+9T/4wjVhRvngt55AMVgjq8P+oge96Er6TZlVeN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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