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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c45fcd40580735171b4b9202cb7c8697bd1a44062ae709eaf05f4511d5efb8' 
  AND token = 'ioM+v7FDgJ9toBjF9lhu08cH4st7Z3N7B7XXryU9P3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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