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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6473528ca960761b4e3fd9b8acb04fdf90b465ae5a8eb83ad25b26b9746a30b5' 
  AND token = '9XLJ46vid3rALBeQcRPPbFSefxIKxgG+mZRT4VjSE38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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