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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083f025ad2cbcbaf2d685fab556784ae31eab5982cc6f017e41a6df67c7bc4ad' 
  AND token = '0j4RYXJFsqA+ybwa5SQrD9rn/LTqQ+/i+ODfivjVkcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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