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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b85527413ed0af6873d0ee2c00cd378595a884e7aa9ee3cb5f4a53ebd76ddc2' 
  AND token = 'MHq+MKzH6LeLiNNt2pWWScWuYHbmASpvA/MYvToUh08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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