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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf837462268d1d0fc4a8e9d9e2c61769275e0b815de9707c0c5ffe50ae4bcebb' 
  AND token = 'PWCn4G87H0KLx5rukHVcYFGp9sBMmwJfV2LGe0PGEPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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