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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a343bf33011f2ab72d4cb48d187d0ec33898d175801dcabff7a6ec1361d850' 
  AND token = 'nJX2yXf/HDouckXVgdPH0kRWN64VLUq2zjYM6PPQsPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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