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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca59a7b86eee846ac1deed35b4cb217eef22d9ba695a73a16652c38d572fdfc' 
  AND token = 'EouHvqY65OF9jT8kLPLriyz6bUG0FYdurpbIkvrhPEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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