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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb086df532e86b123a836c9220f7d208f03fee80bc0be3cf6ad848e2828287e4' 
  AND token = '2f5lOoJ8aqY2qwP5vE8Q1uBjtPDSVJFlalVfyrO29Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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