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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96d319c4ed3f21e8a4c1b158636a48c823fda0312f7aa7a6fd5184cf1713826' 
  AND token = 'czhXIJJ5Iq/neKYHj4JRupSffFCEol2yHpnfEebuU2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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