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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2d1d160b5ccfccf8371b4d703a6764edcc9f8fece5f7c7a3cd558ce80d5f51' 
  AND token = 'tgwhFFi6zoO7/Gxb87eGAeoQZq6Z/uBQyUbk5pnU76k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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