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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1f7af3d909a5119941e25c6bfbad8b7f34d1f31e6aa150afe55c569f7946f6' 
  AND token = '8qHTE8Xk0NMbx6Duir/vas01a81kSZKssyr5wJZCGVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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