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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82cf997948b02aeb0d1ef575725b41b0170b77627438acb4f48aa3c8595b4c5' 
  AND token = 'hJvhEA/aprvEHlnys0dOmhVdQXnMNK04IKHySdJiwtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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