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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54ab40e4ce9d66cccd59715ecdbf4f56bb44ee9c609776e28545cbde584639c' 
  AND token = 'z9dLUrNYEZwGbd2abhVM6aXG7jbyCDU5/tndt2Q/r5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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