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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c34fd41fef3b7260f77b9a48162875ebec03a952d37888fbbb44ae3b3fbabce' 
  AND token = 'gDOLkGlKartwKMSeri/2/3Z9EbAKZhzxp2wH0pDv01M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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