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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6801e3bce44aa504a8ff0a5e67cca6c93139f7b171953ae66cd83fb7a99a94e9' 
  AND token = 'UxQgSDQ9R/5Emlyxabi2d+Q6bgXUbomz3fBeScdEmS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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