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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928979e26f37eda63075be1c465e036a898e625e400f6d8cfd67b02c86e4f21a' 
  AND token = '4yuf8JZZWayoF6zxQe3LnHFSNoC+ltI7dO0dzdJxf3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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