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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc08dadbf0409ca9fd1cc8560aad66899e4e729eabfff87aee5628b7cbd03ce' 
  AND token = 'iP7JUckt0exd4PlGu3s4Kj3vxwtpuo3nyFv7EBK4+R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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