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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a00232967d6c1ee0634629a487eaec546c93ae9c5fe802a754fc4f9c19dc741' 
  AND token = '90LBUfRdYmA8eNWZ1HrJEJJ5HN+M1HoSQ7p4xEuo3/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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