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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4f7f2b107e86f7bb7aade8cf54da30fb2201c4607fb15d2d9efa20748727a7' 
  AND token = '29ywUlhq6W/Cc5RGW3I8b0pT6IfLPlSrV8cK3IhLluQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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