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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab6b3a00da6d61df6da20b8321cf714edeff95876bcaf6b136bf48248baa055' 
  AND token = 'gRNNAYN/aPtJSp9EHNQeVLWFjRzMqS1FLn68bW80PXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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