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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c00720b03bd8f4a6ffd72bb416bc5e391f64eb370e61000198393884667e45' 
  AND token = 'HIYrriMnS9xv9XERmhSzf3vhtdmqxp5F3xXTzP7NPW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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